Re: Too much nectar not enough brood?
Yes, your queen is near the center of the second photo. The frames look good. She can only lay as fast as she has nurse bees to raise what she lays. Yes there is sealed brood, as well as eggs and open larva. You also have nectar and honey and pollen stores. Everything looks pretty good from here. I'd say keep on doing what you have been doing. As she gets more brood emerge, and lays more, then gets more brood emerge, the hive will reach a point where it starts growing faster. It takes about 6 weeks to notice. Remember, bees are dying every day but the queen lays faster than bees are dying.
They draw wax from nectar, and they backfill the brooding area some until they get shy of room, then they'll start drawing comb more to get more room for brood, it's kind of like a balancing act. So keeping the syrup on them to supplement the flows will keep them drawing wax. Once they get started drawing wax, then they'll keep on doing it so long as they have nectar or syrup enough coming in faster than what's needed to feed the brood that is there.
20+ years with bees and still learning. Currently near Marysville, CA, 95901